If...end statement for taylor series expansion code

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Zelda Luxenburry
Zelda Luxenburry 2012-2-13
编辑： dpb 2013-10-9
this is my function m file, but I cant seem to get it to work. the code runs but the value of mycos1(.5,100) is not equal to cos(.5), for instance. cant seem to find where the mistake is...
function [cosx] = mycos1(x,n)
%evaluates and sums the first n terms of the Taylor series
% use the for loop control structure to express the infinite taylor
% series
if n<=0
error('n must be positive')
end
if rem(n,1)~=0
error('n must be an integer')
end
cosx=1;
i=0;
for i=1:n+1
cosx=cosx+(((-1)^i + x^(2*i))/factorial(2*i));
end
end

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回答（1 个）

John D'Errico
John D'Errico 2012-2-13
I'm just wondering why you put a return statement as the very first executable line of code? Is it possible this is the problem? What happens when matlab hits that return?
  1 个评论
Zelda Luxenburry
Zelda Luxenburry 2012-2-13
when I delete the "return", the error reads "line 7 error, not enough input arguments"...what would be a better way to say "if n is nonpositive or not an integer, display error" ?

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